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This specimen was identified by David W. Behrens as a version of Rostanga sp. 1 in IPN at page 191.
Let me quote the description: "This species is unusual among species of Rostanga in having a white to pink body color."
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs.
Sea Challengers Natural History Books. Gig Harbor, Washington. 426pp.
How to cite:
Köhler, E. (2018), published 2 May 2018, Rostanga sp. 04 Genus: Bergh, 1879
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Doridina/Rostanga_sp_04.htm